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Math expert .. How to calculate the range and area according to the latitude and longitude?
This is the use of: latitude distance 1 degree =111.1km.

Calculated by the relationship between; Longitude 1 degree =11.1COSA

(a) is the latitude for calculating longitude. For example, if the distance of longitude 1 degree is calculated at 60 degrees north latitude, it is11.1xcos60 =1.1/2km.

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